Best Ending?

1-2) Best Ending?
After being ridiculed by his younger sister, the rather disappointing Sakura decides to take a leaf out of an otome manual and, in hopes of becoming popular with the ladies, learn to become a sparkling prince. Even though he meant to charm a girl's heart, he instead reels in a male teenager named Jun...?!

3-4) Swim'n Love
5) Get Bored with Each Other
6) Best Ending? Bangaihen

(Source: The Back Door, edited)